ADIPOQ and Abdominal obesity: However, there are a limited number of studies regarding the association between abdominal obesity and each adiponectin isoform (HMW adiponectin [HMW-adn], MMW adiponectin [MMW-adn], or LMW adiponectin [LMW-adn]) among population-based elementary school children, especially in Japan, where blood collection is not usually performed during annual health examinations of school children.